ERA5 almanac comparison — 8 years of real data
Cancún vs Kiawah Island: weather in January
Cancún edges out Kiawah Island for sun in January: 21% clear historically versus 1% (8-year ERA5 average, a 20-point gap). Cancún also sees measurably more rain than Kiawah Island this month (50% vs 31% of days). Both are viable — Cancún is the safer bet.
Cancún
Mexico
- Clear days, January
- 21%
- Sample size
- n=248 days
- Avg high
- 79°F
- Early January (1st–15th)
- 22%
- Late January (16th–end)
- 21%
- Rain frequency
- 50% of days
Kiawah Island
SC
- Clear days, January
- 1%
- Sample size
- n=248 days
- Avg high
- 57°F
- Early January (1st–15th)
- 2%
- Late January (16th–end)
- 0%
- Rain frequency
- 31% of days
Frequently asked
Is Cancún or Kiawah Island warmer in January?
Cancún runs warmer by day in January. Cancún averages highs of 79°F (highs n=248 days); Kiawah Island averages highs of 57°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Cancún or Kiawah Island in January?
Cancún is measurably wetter than Kiawah Island. Days with measurable rain: Cancún 50%, Kiawah Island 31% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in January, Cancún or Kiawah Island?
Cancún edges out Kiawah Island for sun in January: 21% clear historically versus 1% (8-year ERA5 average, a 20-point gap). Cancún also sees measurably more rain than Kiawah Island this month (50% vs 31% of days). Both are viable — Cancún is the safer bet.
Compare Cancún vs Kiawah Island in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.